Why is the engine warning light constantly on?

1 Answers
LaAdriana
07/30/25 4:02am
The reasons why the engine warning light stays on are: 1. Excessive carbon deposits inside the engine, leading to poor gasoline atomization, damaged oxygen sensors, or incomplete combustion of gases in the combustion chamber; 2. Damaged spark plugs in the engine, causing cylinder misfires and insufficient power; 3. Damage to components of the vehicle's exhaust system, such as oxygen sensors and the three-way catalytic converter, resulting in substandard vehicle emissions; 4. Overheating of coolant or oil temperature, in which case the vehicle should be pulled over, turned off, and allowed to cool down. If the engine warning light remains on, the owner can try restarting and turning off the vehicle three times in a row, or disconnect the negative terminal of the car battery for 30 seconds before reconnecting it, to check if it's a false fault of the engine. If the warning light persists after these attempts, it is necessary to visit a 4S shop or repair shop to have technicians read and clear the fault codes using diagnostic equipment.
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